how to create programs In Ubuntu

At the very low level, for c/c++, just use a text editor (vi, emacs, or some other graphical editor available on ubuntu) and a compiler (gcc/g++); you will also have to learn how to create makefiles and all that junk.

You can also use an IDE like Code::blocks, Eclipse, ... to help you manage your project.

For Java, I think there's NetBean.

For AJAX, I don't have a clue, me think vi will probably be enough for that.


For all of the above you might have to install a "package" of some sort, for the compilers, IDE and all supporting libraries.


Good luck.

C++: I would recommend Anjuta:
http://en.wikipedia.org/wiki/Anjuta[^],
http://www.anjuta.org/[^].

Java: NetBeans, Eclipse:
http://en.wikipedia.org/wiki/NetBeans[^],
http://netbeans.org/[^],
http://en.wikipedia.org/wiki/Eclipse_%28software%29[^],
http://www.eclipse.org/[^].

Ajax: There is no such thing as "Ajax program". You need something to develop with JavaScript. Probably also Eclipse:
http://eclipse.org/downloads/packages/eclipse-ide-javascript-web-developers/heliosm5[^].

—SA